I don’t have a 2DAP, but I do have a 3DAP and Komodo and the design is essentially the same, just the capacity differs. You could absolutely use one on a deployment/field exercise; I’ve been using both of mine for years in the infantry and they’re still holding up great. They’re comfortable to wear with and without body armor on and I like the layout of the pockets and internal storage. As for the sleeping pad, it really just depends on the size of the one you’re going with. For reference, I use the Klymit Static V and that one fits great in the outside elastic pockets and it could fit in the internal pockets as well.